Improvement in monkey-wrenches



E. T." B-ARLDW. MONKEY-WRENCH.

Y Patented Jan. 11, '1876.

UNITEDSTATES A N OFFICE ELISHA T. BA Lowmr SAN FnANoIsoo, CALIFORNIA.

iMPRovEMENTlN"Mo K'EY-wRENcHEs.

CAsE O.

To all whom it may "concern:

Be it known that I, ELISHA T. BARLOW, of San Francisco, county of San Francisco and State of California, have invented a new and useful Improvement in Wrenches; and I do hereby declare the following to be a full and exact description thereof, reference being had to the accompanying drawing forming a part of this specification.

My invention relates to a type of wrench technically known as monkey-Wrenches; and

it consists inthe construction and arrangement of the several parts hereinafter described, and pointed out in the claims.

In the drawing, Figure 1 shows a side e1evation; Fig. 2, a view, in perspective, of the movable jaw. Fig. 3 shows a segment of cogteeth, provided with a spline that fits within a groove on the main bar, and is capable of a slight longitudinal movement,fully explained hereafter. Fig. 4' shows the main bar and hammer-head jaw. Fig. 5 is adetached view of the shield, inclosing-the adjusting mechan-- ism. Fig. 6 shows a spring for keeping the cog-teeth of the movable jaw in connection with the teeth of the segment referred to. and an arm and socket for attachment to the shield and main bar. Fig. 7 shows a disk for setting up the movable jaw snugly after the adjustment.

Ais the shield, securely attached to the main bar Oand arm E by the rivets e c. It

engaging the cog-teeth, and also to adjust the jaw. A projection or button, 0, is arranged upon the end thereof, to serve as a thumbpiece. U G is the main bar and hammer-head jaw, 0 being the portion to receive the wooden handle N. g is a groove or slot to receive the spline F on the segment F. A cavity, w, is also provided for the extension as of the spline. D is a pivoted disk, having a spiral thread, '1, surrounding the cavity or recess upon its under side, Fig. 7. The hook 3 on the spline F engages with the thread 3 the end so of the segment F bearing against the cam-shaped periphery of the disk D. The segment F is allowed a slight longitudinal movement in the groove g, so that when the cog-teeth are engaged with the corresponding ones on the movable jaw, and the disk D,

which bears upon the end or, is turned in one direction, the camperiphery of the disk forces the movable jaw forward, and when. the cam is moved in the opposite direction the hooky relieves the jaw, and the adjusting parts are easily operated. The object of this arrangethe wrench and to the shield. It supports a spring, E, that bears upon the shank of the movable jaw, and keeps the cog-teeth in engagement. I

It will be observed that the disk D and handle-lever I are very conveniently arranged to be operated by the same hand that grasps and holds the wrench.

The bar A is connected to the hammer-head and shield, and is also securely attached to the under side of the main bar. This adds greatly to the. strength of the wrench at this portion.

Thissupplemental bar may extend the entire.

length of the main bar, and-its external surface threaded at the end to engage with the. nut that secures the handle, as shown in Fig. 5.

I am aware that wrenches have been constructed with corresponding cog-teeth arranged upon the main bar and movable jaw,

and I am also aware that cam-levers have Specification forming part of Letters Pat ent No. i72.241, dated January 11, 1876, application filed 1' l January 8, 1876.

movable 'jaw B B B, provided with the cogteeth 8 s s and handle-lever I, in combination with the toothed segment F, having spline F,'

and the main bar 0, provided with the groove g, the parts being arranged and operated substantially as shown anddescribed.

2. The segment F, having spline F, tenon as, and hooky, in combination with the camdisk D, for the purpose specified.-

3. The combination of the main bar 0, provided with the hammer-head O and the bar A, constructed and arranged as shown and described.

4. The combination of the shield A, the arm E,.carrying the spring E, and the main bar 0, as shown and described.

' ELISHA T. BARLOW.

In presence of- F. O. WEGENER,

GEO. A. WORZ. 

